"Drought and demand are pushing the Colorado River beyond its limits — with the needs of more than 40 million people in seven Western states projected to outstrip dwindling supply over the next 50 years, according to an advocacy group's report on endangered rivers released on Wednesday."

"The annual top-10 list by Washington, D.C.-based American Rivers points to a three-year federal Bureau of Reclamation study that warned last December that the river won't always be able to serve all the residents, businesses, ranchers, Native Americans and farmers who rely upon it.

Already, the Colorado River is drained of nearly every drop by the time it reaches Mexico, American Rivers spokeswoman Amy Kober said."